<template>
  <div class="app-container">
    <el-form :model="queryParams" ref="queryForm" size="small" :inline="true" v-show="showSearch" label-width="68px">
      <el-form-item label="分类名称" prop="categoryName">
        <el-input
          v-model="queryParams.categoryName"
          placeholder="请输入分类名称"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item>
        <el-button type="primary" icon="el-icon-search" size="mini" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button
          type="primary"
          plain
          icon="el-icon-plus"
          size="mini"
          @click="handleAdd"
          v-hasPermi="['categories:categories:add']"
        >新增</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="success"
          plain
          icon="el-icon-edit"
          size="mini"
          :disabled="single"
          @click="handleUpdate"
          v-hasPermi="['categories:categories:edit']"
        >修改</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="danger"
          plain
          icon="el-icon-delete"
          size="mini"
          :disabled="multiple"
          @click="handleDelete"
          v-hasPermi="['categories:categories:remove']"
        >删除</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="warning"
          plain
          icon="el-icon-download"
          size="mini"
          @click="handleExport"
          v-hasPermi="['categories:categories:export']"
        >导出</el-button>
      </el-col>
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>

    <el-table v-loading="loading" :data="categoriesList" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" align="center" />
      <el-table-column label="id" align="center" prop="id" />
      <el-table-column label="分类名称" align="center" prop="categoryName" />
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button
            size="mini"
            type="text"
            icon="el-icon-edit"
            @click="handleUpdate(scope.row)"
            v-hasPermi="['categories:categories:edit']"
          >修改</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-delete"
            @click="handleDelete(scope.row)"
            v-hasPermi="['categories:categories:remove']"
          >删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    
    <pagination
      v-show="total > 0"
      :total="total"
      :page.sync="queryParams.pageNum"
      :limit.sync="queryParams.pageSize"
      @pagination="getList"
    />

    <!-- 添加或修改商品分类对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="500px" append-to-body>
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-form-item label="分类名称" prop="categoryName">
          <el-input v-model="form.categoryName" placeholder="请输入分类名称" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { listCategories, getCategories, delCategories, addCategories, updateCategories } from "@/api/categories/categories";

export default {
  name: "Categories",
  data() {
    return {
      loading: true,
      ids: [],
      single: true,
      multiple: true,
      showSearch: true,
      total: 0,
      categoriesList: [],
      title: "",
      open: false,
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        productId: null,
        categoryName: null,
      },
      form: {},
      rules: {
        productId: [{ required: true, message: "关联的商品 ID不能为空", trigger: "blur" }],
        categoryName: [{ required: true, message: "分类名称不能为空", trigger: "blur" }],
      }
    };
  },
  created() {
    this.getList();
  },
  methods: {
    /** 查询商品分类列表 */
    getList() {
      this.loading = true;
      listCategories(this.queryParams)
      .then(response => {
        this.categoriesList = response.rows;
        this.total = response.total;
        this.loading = false;
      });
    },
    cancel() {
      this.open = false;
      this.reset();
    },
    reset() {
      this.form = {
        id: null,
        productId: null,
        categoryName: null,
        isDeleted: null
      };
      this.resetForm("form");
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.queryParams.pageNum = 1;
      this.getList();
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm("queryForm");
      this.handleQuery();
    },
    handleSelectionChange(selection) {
      this.ids = selection.map(item => item.id);
      this.single = selection.length !== 1;
      this.multiple = !selection.length;
    },
    /** 新增按钮操作 */
    handleAdd() {
      this.reset();
      this.open = true;
      this.title = "添加商品分类";
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.reset();
      const id = row.id || this.ids;
      getCategories(id).then(response => {
        this.form = response.data;
        this.open = true;
        this.title = "修改商品分类";
      });
    },
    /** 提交按钮 */
    submitForm() {
      this.$refs["form"].validate(valid => {
        if (valid) {
          if (this.form.id != null) {
            this.checkCategoryExists(this.form.categoryName).then(exists => {
              if (exists) {
                this.$message.error("分类名称已存在，无法新增！");
                return;
              }
              updateCategories(this.form).then(response => {
                this.$modal.msgSuccess("修改成功");
                this.open = false;
                this.getList();
              });
            });
          } else {
            this.checkCategoryExists(this.form.categoryName).then(exists => {
              if (exists) {
                this.$message.error("分类名称已存在，无法新增！");
                return;
              }
              addCategories(this.form).then(response => {
                this.$modal.msgSuccess("新增成功");
                this.open = false;
                this.getList();
              });
            });
          }
        }
      });
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      const ids = row.id || this.ids;
      this.$modal.confirm(`是否确认删除商品分类编号为 "${ids}" 的数据项？`).then(() => {
        return delCategories(ids);
      }).then(() => {
        this.getList();
        this.$modal.msgSuccess("删除成功");
      }).catch(() => {});
    },
    /** 检查分类名称是否已存在 */
    checkCategoryExists(name) {
      return new Promise((resolve) => {
        const exists = this.categoriesList.some(item => item.categoryName === name);
        resolve(exists);
      });
    },
    /** 导出按钮操作 */
    handleExport() {
      this.download('categories/categories/export', {
        ...this.queryParams
      }, `categories_${new Date().getTime()}.xlsx`);
    }
  }
};
</script>
